CVE-2021-41145: high-severity vulnerability in signalwire freeswitch
FreeSWITCH susceptible to Denial of Service via SIP flooding
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.6epss 1.7%
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. FreeSWITCH prior to version 1.10.7 is susceptible to Denial of Service via SIP flooding. When flooding FreeSWITCH with SIP messages, it was observed that after a number of seconds the process was killed by the operating system due to memory exhaustion. By abusing this vulnerability, an attacker is able to crash any FreeSWITCH instance by flooding it with SIP messages, leading to Denial of Service. The attack does not require authentication and can be carried out over UDP, TCP or TLS. This issue was patched in version 1.10.7.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected products
signalwire · freeswitchRelated CVEs — signalwire freeswitch
In the same product, most dangerous first.
CVE-2026-116779CRITICALFreeSWITCH: Inbound SIP MESSAGE can select the api chat proto and run FreeSWITCH API commandsEPSS 1.3%KEVCVE-2021-37624HIGHFreeSWITCH does not authenticate SIP MESSAGE requests, leading to spam and message spoofingEPSS 3.8%CVE-2021-41105HIGHFreeSWITCH susceptible to Denial of Service via invalid SRTP packetsEPSS 2.5%CVE-2021-41157MEDIUMFreeSWITCH does not authenticate SIP SUBSCRIBE requests by defaultEPSS 1.7%CVE-2023-51443HIGHFreeSWITCH susceptible to Denial of Service via DTLS Hello packets during call initiationEPSS 1.5%CVE-2026-116785CRITICALFreeSWITCH: Pre-authentication heap out-of-bounds write in mod_xml_rpc WebSocket frame length handlingEPSS 1.0%